acoustic assessment 1610101 (rev 1) childcare …€¦ · acoustic assessment 1610101 (rev 1)...

ACOUSTIC ASSESSMENT 1610101 (Rev 1)

CHILDCARE FACILITY ‘NARULA CORPORATION’ LOT 180. 17 MEAD STREET &

LOT 181, 1 MARCHANT WAY, BYFORD WA 6122

prepared for

MACRI BUILDERS PTY. LTD

PO Box 2124, Malaga WA 6944 E: [email protected] T: (08) 9249 9619 M: 0412 679 431

ND Engineering Consulting Engineers

nde

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ACOUSTIC ASSESSMENT 1610101 REVISON 1 CHILDCARE FACILITY ‘NARULA CORPORATION’

LOT 180 (17) MEAD ST & LOT 181 (1) MARCHANT WAY, BYFORD WA 6122 ____________________________________________________________________________________________________________

____________________________________________________________________________________________________________ nde ND Engineering Consulting Chartered Engineers of 21

Acoustics, Noise & Vibration - Air Conditioning & Ventilation – Energy Efficiency

CONTENTS: SECTIONS: 0. Summary. 1. Introduction. 2. Description. 3. Assessment. 4. Conclusions. 5. Recommendations. ANNEXES: A. Location.

B. Site Plans. C. Assigned Noise Levels. D. Children. E. Music. F. Carpark. G. Mechanical Services.

REFERENCES:

A. Environmental Protection (Noise) Regulations 1997.

B. Drawings: (1) Frank Macri Design Consultant, 3 sheets, revision 001, dated 28 OCT 16; (2) Ross McLoughlin consulting surveyor, 1 sheet, 15 AUG 16.

REVISIONS

Revision No:

Date: Issue / Comment

Status

0

3 October 2016 Development / Planning Approval Current

1

30 October 2016 Development / Planning Approval Current

AUTHOR

N. M. DELLA GATTA BE (Mechanical) MIEAust

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SUMMARY 0.1 ND Engineering's opinion is that the proposed Child Care Centre will comply with the Noise

Regulations (Reference A), during the daytime periods of 0630 - 1830 hours Monday to Friday including if required Saturday 0630 - 1830 hours, subject to implementation of the recommendations contained in Section 5 ‘Recommendations’.

INTRODUCTION 1.1 ND Engineering was commissioned to provide an acoustic assessment of the potential noise

emanating from the proposed Child Care Centre (CCC). DESCRIPTION 2.1.1 The proposed CCC site is located in Byford on the North side of Mead Street between Marchant

Way and Rouse Lane. 2.1.2 The nearest noise sensitive ‘residential’ premises are located to the rear North and then across the

roads to the West, South and East. 2.1.3 Refer to the following Annexes for detailed location and site descriptions: a. Annex A ‘Location’. b. Annex B ‘Site Plans’. 2.2 The main non equipment noise source at the site will be: a. Children’s voices categorised by age groups:

- Kindy 3 - 4 years old; - Toddlers 2 - 3 years old; and - Babes 0 - 2 years old.

Refer Annex D ‘Children’.

b. Occasional music for children in the 0 to 4 year age group with the music being non impulsive by nature.

Refer Annex E ‘Music’.

c. Carpark door opening and closing noises.

Refer Annex F ‘Carpark’.

2.3 The main equipment noise sources at the site are expected to comprise air-conditioning systems

and mechanical ventilation systems. Refer Annex G ‘Mechanical Services’.

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ASSESSMENT 3.1 Noise emissions from the child care centre are expected to occur Monday to Friday between 0630 to

1830 hours and if required Saturday 0830 to 1830 hours, mainly during outdoor play weather permitting for the Kindy group.

This means that for evenings, night time, public holidays and Sundays there is expected to be no noise emissions from the child care centre at all.

Anecdotal evidence indicates this is a desirable situation sought by some residences when

purchasing properties adjacent to a child care centre as their will be no afterhours noise thus negating a common source of complaint.

3.2 The relevant assigned noise levels at receiving premises, residential in the vicinity of the noise

source, as allowed under Reference A are shown in the following Table 3.2. The assessments of the various noise sources emissions from the CCC are assessed against Table 3.2 as applicable.

Table 3.2 – ASSIGNED NOISE LEVELS

Noise sensitive premises at locations . . . . . . . . . . a building directly associated with a noise sensitive use.

Time of day (notional)

Time of day Assigned Noise Levels dB(A)

LA10 LA1 LAmax

. . within 15 m of . . Day 0700-1900 hrs Monday to Saturday

45 55 65

0900-1900 hrs Sunday, Public holidays

40 50

Evening

1900-2200 hrs All days

55

Night 2200-0700 hrs Monday to Saturday

35 45


. . greater than 15 m from . .

All hours 60 75 80

Commercial premies

All hours 60 75 80

3.3 Refer to the following annexes for the detailed assessments: a. Assigned Noise Levels. Refer Annex C ‘Assigned Noise Levels’. b. Children. . Refer Annex D ‘Children’. c. Music. Refer Annex E ‘Music’. d. Carpark. Refer Annex F ‘Carpark’. e. Mechanical Services. Refer Annex G ‘Mechanical Services’. 3.4 Recommendations arising from the assessments are collated and presented in Section 5

‘Recommendations’ in the main body of the report.

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CONCLUSIONS 4.1 ND Engineering's opinion is that the proposed Child Care Centre will comply with the Noise

Regulations (Reference A), during the daytime periods of 0630 - 1830 hrs Monday to Friday including if required Saturday 0630 - 1830 hours, subject to implementation of the recommendations contained in Section 5 ‘Recommendations’.

RECOMMENDATIONS 5.1 The recommendations presented in this report are in outline format only and require: a. Detailed final design of components by appropriately experienced persons in accordance with the

current relevant editions of Australian Standards, Regulations, Gas Installation Code/s and the Bca. b. Completion of minor details, including acoustic/vibration details, on site by competent and qualified

tradesmen and technicians. c. New materials and equipment to be installed in accordance with the manufacturer's and/or supplier's

instructions. d. New materials and equipment to comply with, and be installed in accordance with, the BCA. e. Installer of materials and/or equipment to comply with:

(1) Regulatory safety requirements. (2) The safety procedures on the relevant Materials Safety Data Sheets (MSDS). (3) The site safety requirements including the wearing of protective clothing such as safety

boots, safety glasses, safety goggles and hard hats. f. A site inspection to fully determine the extent of the work and the nature of the site. 5.2 The following recommendations are made: a. Operational:

(1) The CCC is to be operational, excluding public holidays, between 0630 - 1830 hours Monday to Friday and if required 0630 - 1830 hours Saturday;

(2) Staff will be instructed not to arrive prior to 0600 hours and to be off site by 1900 hours. (3) Staff will be instructed to park in the Northern car bays starting from bays 6 to 1. (4) Children are not permitted outdoors, carpark excluded, prior to 0700 hours.

b. Children’s play areas:

(1) Children are not permitted outdoors, carpark excluded, prior to 0700 hours. (3) Practical considerations:

(a) Fixed play equipment should be non-metallic. If metal fixed play equipment is used then hollow metal sections shall be filled with expanding foam or sand.

(b) Concrete or brick paved areas, if any, should be minimised and where practicable covered with synthetic grass to minimise noise of play equipment on hard surfaces.

(4). Restrict the number of children in to the South of Activity 3 to a maximum of 10 children at

any one time; and

(5). Provide the following Noise Barriers (See Figure 5):

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(a) A 1800 mm high solid wall (minimum surface density 15 kg/m2) to be constructed

along the rear Northern boundary from Rouse Lane to Marchant Way (Brick or timber lap are acceptable but colourbond is not acceptable); and

(b) A 1800 mm high solid wall (minimum surface density 15 kg/m2) to be constructed

along the side Western boundary along Rouse Lane and including the SW boundary truncation (Brick or timber lap are acceptable but colourbond is not acceptable); and

(c). Provide a minimum 1400 mm high solid wall to the Activity 1 outdoor play area along

Mead Street, the SE truncation and Marchant Way with matching wall returns back into the property as shown. The solid wall can comprise a mixture of opaque, transparent or laminated glass sections (minimum surface density 15 kg/m2). The portion of the wall between 1400 to 1800 mm can be visually and acoustically permeable.

Figure 5 – BARRIERS c. Music:

(1) Keep external windows and doors closed; and

(2) Do not play music outdoors. d. Carpark:

(1). Staff will be instructed not to arrive prior to 0600 hours and to be off site by 1900 hours; and

(2). Staff will be instructed to park in the Northern car bays starting from bays 6 to 1; and (3). Signage is placed within the carpark asking parents/staff not to slam car doors/boots; and

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(4). Signage is placed within the carpark asking parents/staff not to play loud music. e. Mechanical Services:

(1) Exhaust systems:

(a) No specific external acoustic requirements for small non-kitchen exhaust systems. (b) No specific external acoustic requirements for a domestic kitchen canopy ducted to

the exterior when the kitchen equipment inputs is less than either 8 kW electrical or 29 MJH gas.

(c) Specific external acoustics requirements for a commercial kitchen canopy with an

external fan when the kitchen equipment input is greater than either 8 kW electrical or 29 MJH gas then the exhaust fan shall be:

(i) Located greater than 6.0 metres from a residential boundary and discharge

vertically;

(ii) Operating at a speed not exceeding nominally 960 rpm with a Sound Pressure Level not exceeding 52 dB(A) @ 3.0 m at the operating speed.

(2) Air conditioning systems:

(a) Evaporative AC units shall be of the centrifugal fan type and shall be sized to deliver

the required air quantity on the low speed setting; and (b) Refrigerated AC units shall be of the inverter type with night time ‘quiet/silent’ mode;

and (c) Do not locate the AC unit/s closer than 6 metres to a residential boundary; and (d) AC units shall have Sound Pressure Level not exceeding 61 dB(A) @ 1.0 metre

when operating at rated conditions. (e) Position the refrigerated AC units facing the roads.

End of Report ANNEXES: A. Location.

B. Site Plans. C. Assigned Noise Levels. D. Children. E. Music. F. Carpark. G. Mechanical Services.

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Annex A – Location

Figure A1 – LOCATION (OVERVIEW)

Figure A1 – LOCATION (DETAIL) End of Annex A

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Annex B - Site Plan

Figure B1 – GROUND FLOOR PLAN OVERVIEW 1

End of Annex B

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Annex C - Assigned Noise Levels C1. The assigned noise level, as determined by Reference A, comprises a Base Noise Level and an

Influencing Factor adjustment to take into consideration noise from nearby features such as major roads, industrial and commercial premises. The assigned noise level comprises three criteria being the LAmax, LA1 and LA10.

C2. LAmax and LA1 represent respectively the single maximum noise event and the 1 percentile highest

A weighted sound pressure levels over a representative measurement period. The measurement criteria LA10 represents the 10 percentile highest A weighted sound pressure

level over a representative measurement period of not less than 15 minutes and not more than 4 hours.

ND Engineering’s understanding as a result of discussions with the DEP in March 2005 indicated that a representative measurement period for a CCC would be 4 hours.

C3. Repeated attempts at obtaining statistical noise measurement data at various CCC without

interference from traffic is difficult as most CCC are located on major and/or secondary roads with children playing outdoors when there is significant traffic noise in the morning and afternoon.

The LAmax is fairly easy to obtain as it represents a single noise event such as a shout or scream. The other two criteria LA1 and LA10 are statistical measurements and traffic noise creates significant problems in acquiring the measurement in particular the LA1 measurement. The LA10 measurement criteria provides a reasonable indication of the objectionable noise as any unwanted noise events such as traffic, wind induced vegetation noise and animal noise form a smaller and less significant component which can be partially edited out.

C4. ND Engineering’s assessment is based primarily on the LAmax and LA10 criteria as obtaining a LA1

measurement that is ‘legally’ watertight is virtually impossible or not achievable when gathering noise data for the assessments. As a consequence, the assessments are based on the LAmax and LA10 criteria. The LAmax criteria is the most important criteria as this is the criteria associated with shouting that is most objectionable.

C5. The base assigned noise levels are shown in the following table.

Table C5 – ASSIGNED ‘BASE’ NOISE LEVELS


Time of day


LA10 LA1 LAmax


45+IF 55+IF 65+IF


40+IF 50+IF

Evening

1900-2200 hrs all days 55+IF


35+IF 45+IF



All hours All hours 60 75 80

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C6. The following table shows the Influencing Factor calculation for the adjustments to the base noise

levels for the nearest residences to the childcare centre.

Table C6 – INFLUENCING FACTOR ASSESSMENT

INFLUENCING FACTOR CRITERIA

ASSESSMENT

Item

Criteria Value Criteria Value Totals

Major Road within the

0

( Transport Factor < 6 )

- 100 m radius inner circle veh/day > 15000 6 dB - 0 - 450 m radius outer circle veh / day > 15000 2 dB - 0 Minor Road within the - 100 m radius inner circle

15k > veh/day > 6k 2 dB - 0

Type A 'Industrial and Utility premises' within the

0

( < 30 ) - 100 m radius inner circle 1/10 x Area% < 10 0 % 0 - 450 m radius outer circle 1/10 x Area% < 10 0 % 0 Type B 'Commercial premises' within the - 100 m radius inner circle 1/20 x Area% < 5 0 % 0 - 450 m radius outer circle 1/20 x Area% < 5 0 % 0

INFLUENCING FACTOR = 0 dB(A)

C7. The assigned noise levels at receiving noise sensitive premises, residential in the vicinity of the

noise source, as allowed under Reference A are shown in the following table.

Table C7 – ASSIGNED NOISE LEVELS


Time of day


LA10 LA1 LAmax


45 55 65


40 50

Evening

1900-2200 hrs all days 55


35 45



All hours All hours 60 75 80

End of Annex C

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Annex D - Children D1. Noise emissions from the child care centre are expected to occur Monday to Friday between 0700 to

1800 hours and if applicable Saturday 0700 to 1800 hours, mainly during the two hours of outdoor play per day weather permitting for the Kindy group. This means that for evenings, night time, public holidays and Sundays there is expected to be no noise emissions from the child care centre at all.

D2. Anecdotal evidence indicates this is a desirable situation sought by some residences when

purchasing properties adjacent to a child care centre as their will be no afterhours noise thus negating a common source of complaint.

D3. The Children’s voices categorised by age groups: a. Kindy 3 – 4 years old.

Measurements, observations and discussions with CCC staff since 2000 indicates that this is the most significant noise producing group.

b. Toddlers 2 – 3 years old:

This is a very low noise producing group based on observations and discussions with CCC staff over the last 9 years. Their external play time is generally less than the Kindy group but more than the Babes group. Attempts to obtain noise measurements suitable for use with Environmental Protection (Noise) Regulations 1997 “Reference A” have not been successful mainly due to traffic noise from nearby minor and/or major roads associated with the CCC’s that ND Engineering has been reporting upon.

c. The Babes 0 - 2 years old: This is a very low noise producing group based on observations and discussions with CCC staff on previous assessmenrs. Attempts to obtain noise measurements suitable for use with Reference A have not been successful.

D4. Children, weather permitting, are allowed outside to play for about 2 hours per day being typically about 0830 to 1000 hours and 1500 to 1800 hours with play typically being broken up into about 30 minute sessions at a time. Sometimes the afternoon outdoor play time is not utilised due to higher levels of sun exposure at this time of day. This low number of outdoor play hours is:

(1) Consistent with information obtained from CCC operators since 2005. There are some small

variations between CCC but it is generally consistent with ND Engineering experience with the CCC assessments undertaken since 2005;

(2) Also due to current sun exposure policies as expressed by the Cancer Council’s Sun

Protection Policy which does not recommend outdoor play between 1000 to 1500 hours; (3) Play groups are typically for 10 to 20 children depending upon supervision requirements,

with play times being staggered with children being rotated between outdoor and indoor activities.

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Children 0 to 3 years old - Assessment D5.1 The Babes 0 - 2 years old is a very low noise producing group based on observations and

discussions with CCC staff since 2000. Their external play time is typically about 30 minute sessions. Attempts to obtain noise measurements suitable for use with Reference A have not been successful due to the typically low noise output of this age group.

D5.2 The Toddlers 2 – 3 years old age group is again a very low noise producing group based on

observations and discussions with CCC staff since 2000. Their external play time is generally less than the Kindy group but more than the Babes group. Attempts to obtain noise measurements suitable for use with Reference A have not been successful mainly due to traffic noise from nearby secondary and/or major roads associated with the CCC’s that ND Engineering has been reporting upon since 2000.

D5.3 The noise levels created by small groups of children, in the Babes 0 to 2 years old and Toddlers 2 to

3 year old age groups, is unlikely to cause a problem for any of the surrounding residences due to the:

a. Low noise output of this age group; and b. These age groups engage in parallel play, rather than group play, at this stage of their social

development which is a low noise activity; and c. Short duration of outdoor play times, typically 30 minutes, especially if the weather is not mild. Children 3 to 4 years old - Assessment D6.1 This proposed childcare centre was not operational at the time of assessment so measurement data

from the Jellybeans Greenwood childcare centre was utilised. The measured noise data shows that for a group of 15 children in the Kindy age group playing in a concentrated play area being a combined fort, sand pit and swing set, produced a sound pressure level of:

a. LAmax = 77 dB(A) to 83 dB(A) depending on how close the child was to the microphone which could

be anywhere from 3 metres to 15 metres. A calculation adjusting the range of LAmax to a single point centred on the play area results in a LAmax = 77 dB(A) @ 10 metres for design purposes and the LAmax is independent of the play group size;

b. LA1 measurement could not be made due to traffic noise interference however an estimate is about

LA1 ~ 71 dB(A). It should also be noted that it is highly unlikely that a LA1 measurement could be made in accordance with Reference A due to the presence of Wanneroo Road traffic noise.;

c. LA10 measurement adjusted for 4 hours and different group sizes, as the LAmax is dependent on

the play group size, are:

(1) LA10 = 53 dB(A) @ 10 metres for 5 children. (2) LA10 = 56 dB(A) @ 10 metres for 10 children. (3) LA10 = 59 dB(A) @ 10 metres for 20 children. The LAmax, LA1 and LA10 is based at a nominal 10 metres from the centre of the fort play area using a representative measurement duration of 4 hours which includes 1.0 to 1.5 hours of outdoor play. Note that in the 3 to 4 year old group the younger children tend to engage in parallel play rather than engage in noisier group play. The children do not play in static groups but move about either individually, between groups or as small groups of 3 to 4 children. The only time children have been observed in large groups is when they moved onto the grassed play areas away from the concentrated play equipment for story telling or other low noise producing activities under control of carer/s.

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Figure D6 below shows the measurement site utilised to obtain the design data used in this assessment. The use of a 10 m distance is conservative and could be reduced to as low as 5 metres. The implication is that the noise value of LA10 = 59 dB(A) @ 5 metres is actually equivalent to LA10 = 53 dB(A) at 10 metres which means that the design data could be overestimated by up to 6 dB(A).

Figure 4.3.1 Greenwood Measurement Site D6.2 The following points should be noted regarding the assessment methodology: a. The assessment of the various residences is based on noise travelling from the centre of the play

area to a point 5 metres in from the residential boundary. b. The assessment methodology has been utilised by ND Engineering in its current format and has

been developed from data and experience acquired since 1997. c. The LA10 contains traffic noise, therefore it is a conservative value especially for low frequencies. d. For the purposes of this CCC assessment playgroups will be modelled as groups of 20 children. D6.3 ND Engineering’s assessment is that the noise emissions from the kindy play area as currently

presented see Reference B and Annex A, complies with the assigned noise levels, see Figure D6.1 and Figure D6.2, to implementation of the recommendations.

D6.4 ND Engineering recommendations are, in addition to limiting the number of children in Activity 1

outdoor play area to 10 children at any one time, to provide the following Noise Barriers (See Figure 5 in the Recommendations section of the report).

a. A 1800 mm high solid wall (minimum surface density 15 kg/m2) to be constructed along the rear Northern boundary from Rouse Lane to Marchant Way (Brick or timber lap are acceptable but colourbond is not acceptable); and

b. A 1800 mm high solid wall (minimum surface density 15 kg/m2) to be constructed along the side

Western boundary along Rouse Lane and including the SW boundary truncation (Brick or timber lap are acceptable but colourbond is not acceptable); and

c. Provide a minimum 1400 mm high solid wall to the Activity 1 outdoor play area along Mead Street,

the SE truncation and Marchant Way with matching wall returns back into the property as shown. The solid wall can comprise a mixture of opaque, transparent or laminated glass sections (minimum surface density 15 kg/m2). The portion of the wall between 1400 to 1800 mm can be visually and acoustically permeable.

D6.5 Refer to the Section ‘Recommendations’ in the main body of the report.

Wanneroo Rd

Kindy play area 8m x 16m

Measurement location 1m from play area fence and boundary wall

Residence

Boundary wall Sand pit, fort and swing set

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Figure D6.1A – OUTDOOR PLAY AREA3 LA10 ASSESSMENT 10 CHILDREN

Figure D6.1B – OUTDOOR PLAY AREA3 LA10 ASSESSMENT 15 CHILDREN

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Figure D6.2A – OUTDOOR PLAY AREA 3 - LAMAX ASSESSMENT North

Figure D6.2B – OUTDOOR PLAY AREA 3 - LAMAX ASSESSMENT West End Annex D

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Annex E - Music E1. Typically, music produced within child care centres is for short durations as part of an activity and is

played at a low volume as small children will typically not be able to follow instructions in rooms with a high noise background.

Basically music levels will need to be kept at about 60 dB(A) or lower within the room which is

equivalent to the noise level produced by a conversational adult male voice at 1 metre. The music is typically non impulsive, minimal bass, thus minimizing the main source of complaint

typically associated with music. E2. The reduction in noise levels to the nearest residential boundary has been calculated to be at least

20 dB(A) as a result of attenuation due to the transmission loss of the glass. Essentially with all external doors and windows closed the noise level due to music at the nearest

residential boundary will be about 35 dB(A) which with all adjustments included is well below the daytime assigned noise level of LA10 = 45 dB(A).

E3. Reductions due to distance and boundary fence reductions have been included in the preceding

calculation and are expected to be about 3 to 8 dB(A) with an average of 5 dB(A). E4. Refer to the Section ‘Recommendations’ in the main body of the report.

End Annex E

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Annex F - Carpark F1. Carpark noises typically may comprise adults talking and children’s voices, car radios and car doors. F2. Essentially the first and last persons on site are the CCC staff. The CCC staff parking should be

restricted to car bays outside of the drop off zone in order to reduce parental stress by allowing them to park closer to the CCC doors.

F3 Observations on various CCC site shows that pickup and drop offs are generally fairly quick

especially in the morning. The morning drop offs tend to occur in several distinct groups being the trades/building/construction workers drop off at or prior to 0730 hours, the first school morning drop off at about 0815 hours (prior to older siblings being taken to school) and the other school morning drop off at about 0915 hours (when older siblings have been dropped off at school in the morning).

F4.1 Measurements and observations were conducted at the Kids Campus CCC on 103 Canning Road

Kalamunda on the morning of Wednesday 14 SEP 05 between 0730 to 0830 hours in order to obtain carpark noise data and discuss operational matters with the manager. This carpark contains about 21 car bays with about 15 on the residential side of the carpark and 6 on the CCC building side.

F4.2 A series of three noise measurements on site at the Kids Campus CCC side of the residential

boundary showed noise levels as follows: Cars doors closing LAmax = 54 to 58 dB(A) at approximately 10 metres; and Children talking about LAmax = 50 dB(A) at approximately 10 metres.

ND Engineering measurement point near the residential boundary was located about 10 metres from the CCC entry doors. Parents were not made aware of ND Engineering’s presence so that the behaviour was allowed to be as normal as possible. The entire carpark location was fairly reverberant. Parents were parking fairly close to either side of or in front of the CCC entry doors.

The LA10 and LA1 measurements were meaningless as the noise from the nearby road heavily contaminated these two measurements however it would be safe to say that the LA1 and LA10 would be lower than the LAmax measured values.

F4.3 These LAmax noise levels are not significant and given the short duration of the drop off the

application of tonality and modulation penalties could not be applied to the measurements as the duration of the event was less than 10% of any representative measurement period. The only penalty that could be applied is if car doors are slammed resulting in the application of an impulsive penalty of +10 dB(A). The following figures show that for normal car door action the situation is one of compliance with the assigned noise levels however slamming of car doors would not be compliant prior to 7am and thus a noise management is required via signage.

F5.1 ND Engineering’s assessment is that the noise emissions within the carpark as currently presented,

see Reference B and Annex A, complies with the assigned noise levels subject to implementation of the recommendations.

F5.2 ND Engineering recommendations are: a. Staff will be instructed not to arrive prior to 0600 hours and to be off site by 1900 hours; and b. Staff will be instructed to park in the Northern car bays starting from bays 6 to 1; and c. Signage is placed within the carpark asking parents/staff not to slam car doors/boots; and d. Signage is placed within the carpark asking parents/staff not to play loud music. F6. Refer to the Section ‘Recommendations’ in the main body of the report.

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Figure F5.1 – CARPARK BAY 1 LAMAX ASSESSMENT - NON-IMPULSIVE


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Figure F5.4 – CARPARK BAY 11 LAMAX ASSESSMENT – IMPULSIVE End Annex F

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Annex G – Mechanical Services G1. The main equipment noise sources at the site are expected to comprise: a. Air-conditioning being either:

(1) Evaporative ducted; or (2) Refrigerated reverse cycle air conditioning systems configure possibly as a mixture of

ducted and wall mounted systems; b. Mechanical ventilation exhaust systems (for Bath, Kitchen, Laundry, WC’s) being typically of two

types for;

(1) Rooms with an external non-boundary wall having either window or wall mounted exhaust fans; and

(2) Rooms without an external non-boundary wall having either:

(i) Ceiling mounted exhaust fan ducted vertically to the exterior through the roof; or

(ii) Bulkhead/ceiling ducted exhaust system to a non-boundary external wall; and G2. The child care centre is expected to be operational, excluding public holidays, between 0630 to 1830

hours Monday to Friday and including Saturday 0630 - 1830 hours. G3.1 The main potential noise source is the air-conditioning condenser units and the detailed

requirements for these AC condenser units are contained in the recommendations section of this report. Essentially the recommendations are the use of inverter AC condenser units and positioning of the AC condenser units at least 6.0 metres from the adjoining properties boundary fences with the AC condenser units facing the roads.

G3.2 The toilet exhaust fans are unlikely to pose a problem and are not assessed in detail. In the unlikely

event that these exhaust discharges through the roof do present some objectionable noise this can be easily overcome by the insertion of some additional acoustic flexible duct into the discharge line.

G3.3 The kitchen exhaust fans will either be of a domestic kitchen canopy type or commercial kitchen

canopy type depending upon the size of the kitchen equipment. If the kitchen equipment has inputs: a. Less than either 8 kW electrical or 29 MJH gas then a commercial kitchen canopy is not required

and a domestic kitchen canopy ducted to the exterior will suffice. In this situation the exhaust system is unlikely to pose a problem and therefore is not assessed in detail.

b. Greater than either 8 kW electrical or 29 MJH gas then a commercial kitchen canopy is required with

an external roof mounted fan. Essentially the exhaust fan will need to be located further than 6.0 metres from a residential boundary with a maximum speed of 960 rpm. Detailed requirements for these AC condenser units are contained in the recommendations section of this report.

G4. Refer to the Section ‘Recommendations’ in the main body of the report.

End Annex G

End of Report

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